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// Copyright (C) 2020-2023 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef IO_SERVICE_SIGNAL_H
#define IO_SERVICE_SIGNAL_H
#include <asiolink/io_service.h>
#include <boost/shared_ptr.hpp>
namespace isc {
namespace asiolink {
/// @brief Defines a handler function for an IOSignal.
typedef std::function<void(int signum)> IOSignalHandler;
class IOSignalSetImpl;
/// @brief Implements an asynchronous "signal" for IOService driven processing
///
/// This class allows a OS signal such as SIGHUP to propagated to an IOService
/// as a ready event with a callback using boost ASIO.
class IOSignalSet {
public:
/// @brief Constructor.
///
/// @param io_service IOService to which to send the signal.
/// @param handler Handler to call when a signal is received.
IOSignalSet(asiolink::IOServicePtr io_service, IOSignalHandler handler);
/// @brief Destructor.
~IOSignalSet();
/// @brief Add a signal to the list of signals to handle.
///
/// @param signum Signal number.
/// @throw Unexpected on error.
void add(int signum);
/// @brief Remove a signal from the list of signals to handle.
///
/// @param signum Signal number.
/// @throw Unexpected on error.
void remove(int signum);
private:
/// @brief Pointer to the implementation.
boost::shared_ptr<IOSignalSetImpl> impl_;
};
/// @brief Defines a pointer to an IOSignalSet.
typedef boost::shared_ptr<IOSignalSet> IOSignalSetPtr;
} // namespace asiolink
} // namespace isc
#endif // IO_SERVICE_SIGNAL_H
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